|SPECIFICATION OF ACETIC ANHYDRIDE|
|Acetic anhydride content
percent by mass, min.
percent by mass, max.
|Iron, Percent by mass, max.||0.0005||0.0005|
|Sulphates, percent by mass, max||0.003||0.003|
|Chlorides, percent by mass, max||0.001||0.001|
percent by mass, max
|Insoluble matter||To pass the test||To pass the test|
|Colour (Hazen) max.||20.00||20.00|
|Ash, percent by mass, max.||0.02||0.02|
|Distillation Range||Difference between initial boiling point and Dry Point shall not exceed 4.0 D.C. incl. 139.5 D.C.(temp. being corrected for 760 mm Hg pressure)||Difference between initial boiling point and Dry Point shall not exceed 4.0 D.C. incl. 139.5 D.C.(temp. being corrected for 760 mm Hg pressure)|
|Reducing Substance Test||-||2 Minutes|
|CAS #||108 - 24 - 7|
|Molecular Formula||(CH3 CO)2 O|
|Appearance||Clear liquid, free from suspended matter, with a pungent odure.|
|Excise Tariff Registration #||2915-20|
|Packing||200 Kg. barrels or 10 M.T. Tanker Loads.| APPLICATIONS
Acetic anhydride (CH2CO2)O (often abbreviated AC2O), is a mobile colorless liquid with a penetrating, choking odor, closely related to acetic acid. It is used in industry for acetylation rections and as a solvent in laboratory applications. The greatest single application is in the manufacture of cellulose esters, chiefly cellulose acetate. It is also used in starch acetylation to make textile sizing agents, in slicylic acid acetylation to aspirin, and in electrolytic polishing of metals, especially aluminium, and semiconductor processing. An undetermined quantity goes into the manufacture of chloroacetic acid and acetyl chloride. It is peculiarly useful for oxidation reactions, not only of metals but also for organic compounds.
Acetic anhydride has a powerful effect on the human body. The odor threshold is 0.49 mg/m3, and the eyes are effected by as little as 0.36 mg/m3. Concentrations> 0.03 mg/m3 throughout a regular workday are inadvisable. Acetic anhydride penetrates the skin quickly and can form painful burns and blisters that are slow to heal. It is particularly dangerous to the tissues of the eyes, nose and mouth, rubber gloves, masks, and goggles are recommended.